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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2123cabacd09cc9d0d04495d453e3dadb6c2a6cdbbb3d8feb2c7cc9da3c55e6a' 
  AND token = 'MpVfsnpVLuuchsjpRrKm5/tBqskjIyNC6SfqNgAHwRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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