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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b899db09a9ff1d7e394b3514a545c2e2c518832e40bd87bee778482f894ed' 
  AND token = 'pwSPl3Iqte2aNNueMTsDhcvFWKWfBytOZVTw5/dIrGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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