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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47c913a23e4e95cb2e470200acdc09ad373efaf54347465fb45cfc824b9177a' 
  AND token = 'psvLk2u4QhWVt6uyA4IGbgxRNZ68ksUK73gXwITS3+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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