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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6843a00b5798c6e73e2e7f2d91b175b1adedea18276c0d08a731869257f9f2d' 
  AND token = 'AqBoSRSVGkUFyuxV5dZYZNi2NV6WqPSd0ia4tZF8oCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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