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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00647ac216df9ccf98634f2428e1f42facab1f82cfe8da05731d97a02d95fe63' 
  AND token = 'HRlTq33OgkOl8/dcJ58X5025Lu1BHZ90kD/InTm1s3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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