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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeb1226f783bf4fd6f5bdf01597383326d07e57d5293dedee1c442236b9ae3c' 
  AND token = '5HUTFNGHLZYwE30wOE7wpz3N7XWbkkLRETRvmKLgbu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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