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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b24f1e9a238627e2ea356dea4cf9aa8c6fb8fc0e8f703e0ab02fafc6d1b288' 
  AND token = '4nWyVTh5QkP/zzrHIKxAxFCLAvEx56YqBe17+eyN4/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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