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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cf62a0658c904a50159ed88400875c62022d71dbe70873a9492ef4ab96d8d2' 
  AND token = 'bZuMuK5YLy7yBzo17K5Hh6QcmOMBGDetbT8FE17aZ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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