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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f52b9020179bb24e1d7a8306a5a27a5d40bed86d1b297145995783b1ee57744' 
  AND token = 'wDuRWDeE7jyl477KNT2ItOSHDMV24AEAm0Ibn7X9JF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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