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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b184b7d708232b5269af46415cf9c7ddea908c8a8318832290d8c0ef88641483' 
  AND token = 'IXBO3Lgt3aMyQHXN+DSDZPVRL4naRCpmtQFnPZDPM2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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