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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236a6f843396a2394389d66e5816eaefb963c740b29b287ddb7fdff1e7cc490f' 
  AND token = 'gS0ZE/4BBNkmlBf+mg7zkO3Ej0+OYtMHcl578Mrdu/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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