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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f44bb24b854982d193c050edbbad989c6d3f4715d1a5872ef2e7ba5cbe8797' 
  AND token = '2dTVIpR4Sz5VRdXxEfnIvRBBNzOaaMxHrNesiXXCY+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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