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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3fb31c2c92db4a0ba5ac047c886a60afc077f78e97fe88f5b6dba683d76e69' 
  AND token = 'mIqSGoZUkCT/ntJSN7641IpTC70KZ5teRF8L9d2o5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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