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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a62c9a84e4a494ed9778718485d6b05de1b3f02fbd5eee3927d353e135984a' 
  AND token = '+7YF/ZV6YlO2yua+ZJfTcOJWSZZVtX3zIH3JC7RL2bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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