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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2be6d4c930d7de6a61c2ae080d51765e7c54d255eafbd01d8e6f0beaa83d0c0' 
  AND token = 'mhYCQTXq8b920iVJFR0vtQdUI5/8QlczcxWePSmW2Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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