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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4479fcfc350212447f74a38b7e850ecf9504a9a5533280f16f7bb9cd14a4ff5d' 
  AND token = '7CYTxr+B7+vrxjKDIzwMMwshyftyCFKPQo5ofQTQi04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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