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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5647bf67da87943edad73abb89c244bc6f84642ddd6ec1824c7b3dd4698ededb' 
  AND token = '8cWBx7ZQl4XqoQ6+T1B9qrdUyse6dTIbL6fvMTB7Wb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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