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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1187e0af4e109cc4c546395bab1e5b112004a3ff3297a7cc590acc2d6d1f72' 
  AND token = 'PrF5Q581vrci24OC3Xc06U4uHWyB1lQmVELazpX1DVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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