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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36502554ddbdba8515cde5a31c6b9ad940de2894dbbc1c3bcbc666f69bcc10f5' 
  AND token = '+SgzP1Az/IHrjytHe3f1FUfQING0SgyZYU0GGvnIzJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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