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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f657967d06e516461175969fa81a31e21c7d3a0b24c7e8a137a9dd254d7aeb6' 
  AND token = '0EqTGVrH0vQ9953F5aVEuye/41VBhJ/L2LumMbjhuZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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