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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404db90b9029fb05507952664cefb7079011cc4670bda024452aee686493606f' 
  AND token = 'k/KW+IvGipn8YX+C/SbkP8m95p1c5Oexi36Ay0MaK9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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