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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfeafe94b5bbd9366123e52f1beb8fb2c2d19918a0dbb804244c797a088fb64' 
  AND token = 'Rn417HSnG4w8wofOe97E+QgQgQYPb4T/WPKsUCyq0oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}