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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73b8a141212b541b4a1587497004de047ed958f679d7f6c46be7ce5d4347568' 
  AND token = '8zwc3KPFA1QeOupVp3wzl1TKgqqudNc+bqTZKTtn+iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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