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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfc77a65597d7a7fc4ebf4543e16466e218b0f7eb05e34aa08c9c0ad2c18992' 
  AND token = 'IgMyQsmEd0w3qAG4gVlPdzLRUAm5iXcAgmn/wd+cDlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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