SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e011b4a582fa3b5551c4d6765cca222ecfd8fae972223f33a64273b0f5207f' 
  AND token = '9+tZlLVSFwlqGZP+BH9VLviH2CqZl9puBlubAbDNXhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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