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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7516e378b65aff88abf20fc175517d1cf7fa240b36a77f0296fe6aafefbc494f' 
  AND token = 'wuqAnHowF/75RJDuIifzdXePa1d10HLzncb5WVyrra8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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