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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20da273f29d337e726fc16b2b247dc40398cdd4413481136d5da84085fceb2e' 
  AND token = 'uZcrtFYpyIgMt3h7CDieCjHZ6J7n6w8BPmgi6I7tMNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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