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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf79e3288bfa9ebf137c90bdb8faaced61f7431bbe28d8155e4e7ff49a528d9' 
  AND token = 'uQ3E5poPak4X5HyBfHWaur8chBahS7z97L7GcZqYcdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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