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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bae74d17c021eab0b96eb86b9f5151df093c58ee8b1b2976bd73fa948a6a74' 
  AND token = 'ab92nzEU7m6Ohw5bQd5RndnIyqsWN/XekaJ4BgyA8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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