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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b724befedbf065246f7a5f0f924933cbcccea0171d612b619eba5e579c0957a' 
  AND token = '4e4FEQyYOjN3sUuQ470k4VoLqs5YDJ8Xdv+TsX8TxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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