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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbe96cabc325d91c3fef4419aece9bcec67ed9a93251ea3239ff4d992c44304' 
  AND token = 'Jpr19tFfeOYsJOYLa+5qLWv8Fkzr3gRVhVkOY9+QqFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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