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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dde45f79bdafbeb72f48fa848f5e42a4574c85946c46219cbd24aaa8885c89' 
  AND token = 'pV4tRHtiidXOe8Q62pmYe1g3/fA/g27MOezuk5YqVPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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