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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0e3f4624be5c962fd4f3afbb950c283075a92c8f8a18fa911f693d9d89789b' 
  AND token = 'f4oxcc6knsvCDjAryeHxAdrAlvdcyRpEq1Q3tu8MV9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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