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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8b302b8cce3436afa6254a5c7db7550ecd8d15614023e70b7ab765a60cf708' 
  AND token = 'DEk9cwX6iVk1z+ZWKRto3ri3dpsq3hR0CDxAtOwrq5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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