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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814e6e6d771ffb176518429c6228f4420e89ef8598e258b1fe26d255f30de8c0' 
  AND token = '4CVSb7Yy31H+phIixFjmwyENGSsY3ItnYBDjMdZ5hN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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