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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66fbd91e2cb0ae2a79a0a5138dc003310ada7f8babcf32c98f2c4ae1921014e' 
  AND token = 'EnlsTQ/8QiLC9u43D02RpxNuxryNTaaqRGWAwKln+so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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