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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9845360552a5b1f30f431c590e1f3dded5dff843f0df12ce587058a8b9f36b80' 
  AND token = 'eCoXMDbsIX3MCxqQej8wy+BL0sRaY9soW3j0SaWzrJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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