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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550e357b02c3b6bece2d4b6f60654aecf2e02bff10677b528451730db04892cd' 
  AND token = '+GfwPC+atSSAt3G58QvthcDaODLNDQhBYBIPu+fqjxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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