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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa5e7ee92eee536a74db99ac040b2dbeb23d8d4a08c124e94cca073080b55e1' 
  AND token = 'cFOh1OY+AKs1Veq4Z0QfUmswm/7ukVdJT5EOjyZ8W7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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