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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70eedfe76f209408bac6274cae34ccd6331693c579f570340ac76e3de57f5ff2' 
  AND token = 'BLxMmxiKFZ5Hs+I6Sf8AFkhoiGq3pUxA2LJYpGOYpo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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