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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7e5a980cd7ab6c4bb962ca237fde14e27532b4d1467d3ebc5aae3e4b644056' 
  AND token = 'Y0Du1O3Co4pTqb4LabTNZ6YZ8IeO6QlStw7AYroUxVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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