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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3125bea907ac5aaf51b30fdb9a491908670696e8981a56b88ebd50c90db8b20' 
  AND token = 'xqPAWjwuWk1bzgPf4mpIeY+V9HUE9V0ox5dpvi4YHUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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