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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2e7cfcc39572840318ceb7857d661e3d4b3b3bde7f82a20119b42de2dbe5d1' 
  AND token = 'YhGe8MX64nH91+4EO3Pn3xajx/xoedvia4Ri3SuP5z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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