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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d15e9799894dc91bfacb82d6a38101a11668fccabb972259994768698ec7e4' 
  AND token = 'wsfSj8cuTlT8rWD2LD0iOC/0E4tKqcRCGZ/CpwzLTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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