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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd62444e721ef538c0039a87ecf38553c355ab1dad10af8acf3e7ad09289e997' 
  AND token = 'tT5dzY/VjdseWLW8eM52k5Y7HyfL8kzwb00KmUOzMAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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