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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e582317219a1179d09f448473082026c3a63e9bd6522ede63b527f1ef4cd10c7' 
  AND token = '+xWO5ZtjdBtTY5cNfNkIjE2fOqpQ9RPXm7qIMTqucdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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