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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af973f8b0b7badeb9480f8573ac5e9f36e732690088838c8a0731e4f4e178e20' 
  AND token = '27ItZ5XjlLVE/o8bABQGfWVUAuJSqfKNq9avijj1FS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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