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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eebdcbcd67d2e649f7f15dbc304ad50a7321cb0222f1ec7d4df9f31631c0f7' 
  AND token = 'P4T6854Y7U03HdD3ETivbM8SEtJyg90R+q5MpZxOyf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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