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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914fecd28bd962fd66e354a29b27a795336404227bf9af29aa0df08b880226d' 
  AND token = '7wc8K8ZAclGxKmOeoe3bCSZ9qjdQHYD2m3lk2kQzKS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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