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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff95b48f8df9f354f21372ff1c10381065aa6e77ac58768e1fffdfaf7662a63' 
  AND token = 'iKADT0tPTmZbEZhFTb1k9d4H2BbSWPW/88btWfuQydw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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