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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb6ea17310e1f7e76b1306fe4b92c2b92e7c29c942b7992e74657d2930105c0' 
  AND token = 'BLviHGt2MO71/tTow6Cv+DwoIs2yMfh014YXGldoUb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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