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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297d32537224b58f13ba1dbb0fd46b05ffb01557f432c0ddb5c5129442c13438' 
  AND token = '1HFQbR9CuXOXV0S2OLmR59Hf3tY0cSW1ppau0LqyqRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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