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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19c4e67e0fc565228e1c8796567c5dda1de11c896d6e097a93035c24e0944a5' 
  AND token = 'FSeQ1vkyC/l6A7Zb3iP6lOGXM8paIe+aSMJNETlhrkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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