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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63665a3c5ae35e8559dd851d3fe37384288033ec950b294b666042758125547b' 
  AND token = 'OBmukzy4eOvPzPEk9eG97WZnvw+qGA+PT5bCKjDHezw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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