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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c0d5daa1a365ad77773603cbfff7b40a86bfea0cd06b290cd494dc45f36e2b' 
  AND token = 'RpQ8HGgQnXLd33hHqzO2QwV12a8CHhbUI2p9qqwXb1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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