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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b025d773ba5a9b80a3e0d5b8fd530d62c85ee1b8a8c8d5fb50431f6952aa0771' 
  AND token = 'YNVEPcuVx0rC9S//EnPC03vJv/QhGg23DksJvERGjAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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