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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df57677eacba19aec97c4bd48657eabeeee1ae7e439817a3a7708890c3744ad0' 
  AND token = 'nAvgECkgcHu6DF1wJkQfcAmnreBFmJgnq9ZhJQGr4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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