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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2439386c99c2796d85de317640d36b9b7f70bb731ed7c3fab2c9b6b464e644fb' 
  AND token = 'FdCixgY7pYXx9TwB0Z35UMks8JbXi4QbJPY5MOjtHFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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