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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01d17adf532b032b8e6e27d8cd67648cf7126035a36b09ffb4470b22ec84f30' 
  AND token = 'M1ItE9lFPrh3j/rCCDCAX82QSzMsIUlWXOuJKTrSK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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